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1、 Language Ifsentences If引导的条件状语从句 Ifyoucoolwater itturnsintoice ifclause从句 mainclause主句 Ifsentences if引导的条件状语从句 1 Ifyouheatmetal itmelts 如果把金属加热 它就会融化 2 Waterturnsintoiceifyoucoolit 如果你冷却水 它就会变成冰 ifclause从句 mainclause主句 从句 主句 从句 主句 从句在主句前时 用 不用 逗号隔开当主句在前时 则 用 不用 逗号 不用 用 Ifyoudropaglass itbreaks Ifyo
2、uheatice itmelts Ifyoustandintherain yougetwet 主句和从句都用 时态 因为if引导的条件句说的是 一般现在时 客观事实 普遍现象 Actionswithdefiniteresults 读下列例句 试着自己总结if的用法 1 Ifyouheatmetal itmelts 如果把金属加热 它就会融化 2 Waterturnsintoiceifyoucoolit 如果你冷却水 它就会变成冰 3 Ifyoustandintherain yougetwet 如果你站在雨里 就会淋湿 4 Ifyoudropaglass itbreaks 如果你把玻璃杯掉在地上
3、 它就会碎 由例句我们可以知道 如果if引导的条件句谈论的是一种 时 主句谓语动词便不用shall will 动词原形 而直接用 时的动词形式 真理 客观事实 一般现在 ActionswithDefiniteResults Water turn intoiceifyou cool it Ifyou stand intherain you get wet turns cool stand get b d g a h c f e ExerciseA1 1 Ifyou water 2 Aballoon it 3 Ifyou water 4 Metal it 5 Wood water 6 Aglass
4、 it heatice itturnsinto burstsifyoustickapininto coolsteam itturnsinto meltsifyouheat floatsifyouputitinto breaksifyoudrop ExerciseA2 Actionswithpossibleresults 读下列例句 总结if的用法 1 Ifheruns he llgetthereintime 如果他跑步去 就会及时赶到那 2 Hewillhelpyouifyouaskhim 如果你请他帮忙 他会帮你的 3 Ifyoufailintheexam youwilllethimdown
5、 如果你考试失败了 你会让他失望的4 Ifyougetuplate youwillbelateforschool 如果你起床晚了 上课就会迟到 由例句我们可以知道 在if引导的条件状语从句中 如果从句谈论的是一个有可能发生的事实以其产生的相关结果 从句用 主句用 一般现在时态 一般将来时态 主将从现 I stay athomeifit rain tomorrow Ifhe notcome I go swimmingalone willstay rains doesn tcome willgo ActionswithPossibleResults Ifyougetuplate youwillbe
6、lateforschool Lookandsay getuplate lateforschool Ifthetelephonerings Iwillanswerit Lookandsay ring answer IfIhavealotofmoney Iwillbuyabighouse Lookandsay alotofmoney abighouse hard working Ifsheishard working shewillgetgoodgrades getgoodgrades Lookandsay gofishing IfitissunnythisSunday I llgofishing
7、 Lookandsay sunnythisSunday P105B WilliamhasfiveproblemsGivehimsomeadvicefromcolumnAandB1Isometimesforgettotaketherightbooktoschool Ifyoucheckyourtimetableeverynight you llknowwhichbookstotake 一 判断正误 如果有误 请更正1 Ifyouwilldomoreexercisethissummer youwillbeveryfit 2 Thecandleburns ifyoulightit willdo do
8、 把逗号去掉 3 IwillbuildmanyschoolsforthepoorchildrenifIwinabilliondollars 4 Ifyoufreezewater itwillturnintoice 5 Myunclevisitsthemuseumifhewillhavetime 正确 willturn turns visits willvisit willhave has If的两个意思 If 如果 是否 引导条件状语从句 引导宾语从句 Idon tknowifhewillcometomorrow Iwillgotothecinemaifitdoesn train 主现从现 主
9、将从现 if可用将来时 BettywillvisittheHistoryMuseumifit rain tomorrow Benwantstoknowifit be finetomorrow If引导的条件状语从句不用将来时 意思为 如果 If引导的宾语从句可以用将来时 意思为 是否 doesn train willbe 是否 如果 Exercises Hewillhelpmewithmymathsifhe free AwasBwillbeCwouldbeDisIdon tknow hewillcometomorrow hecomes I lltellyou Aif WhetherBwheth
10、er WhetherCif ThatDif If3 Pleasetellhermytelephonenumberifshe want toknow wants D D 4 Willyoucomeandstaywithusforawhileifyou finish doingyourhomework Wangdoesn tknowifthere be anEnglisheveningnextweek Mikeaskedmeifwe ask anyquestionsthenextclass Wearegoingforpicnictomorrow I llcallWendytomakesure Aw
11、hytostartBwhentostartCwhattostartDwhichtostart wouldask finish willbe B 8 Wouldyoupleasetellme next Thinkitover You llfindagoodway AwhentodoBhowtodoCwhattodoDwheretodo9 Idon tknowifmyuncle Ifhe Iwillbeveryhappy Acomes willcomeBwillcome willcomeCcomes comesDwillcome comes10 EitheryouorI goingtoShangh
12、ai Onlyonepersonmaygothere AareBwereCamDwas C D C 11 Ifit sunnytomorrow I boating A isgoB willbe goC is willgoD willbe willgo 12 whatwillyoudoifit tomorrow I llstayathomeandwatchTV A rainB rainsC willrainD israining C B 13 Ifhe I himthetime A comes tellB willcome willtellC comes willtellD willcome t
13、ell 14 Ifit it cold A snows willbeB snows isC willsnow willbeD willsnow is 15 Ifyou astoneintowater it A put sinksB put willsinkC willput sinksD willput willsink C B A 11 He help mewithmymathsifhe be free 12 Idon tknowifJim tomorrow Ifhe Iwillbeveryglad come 13 tell hermytelephonenumberifshe want to
14、know 14 Ifit be sunnytomorrow I go boating 15 Ifyou boil water it turn intosteam 16 Youcan travel aroundtheworldifyou have money willhelp is willcome comes Tell wants is willgo boil turns travel have Translatethefollowingsentences 1 如果你请他帮忙 他会帮你的 Ifyouaskhim hewillhelpyou 2 如果你考试不及格 你会让他失望的 Ifyoufai
15、lintheexam youwilllethimdown 3 如果你作业做完了就可以回家了 Ifyouhavefinishedthehomework youcangohome 4 如果熊陷入危险 它们就攻击人 Ifbearsareindanger theyattackpeople 5 如果我早早地到那里 我就可以快点看病 IfIgetthereearly Icanseethedoctorquickly 翻译下面句子 1 如果明天不下雨的话 我就和同学们去动物园 2 如果周六你去购物的话 我就去 Ifitdoesn traintomorrow Iwillgotothezoowithmyclassmates IwillgoshoppingonSaturdayifyougo Testyourself 3 如果可能的话 我就去火车站接你 4 如果你想减肥 就锻炼身体吧 Ifpossible I llmeetyouattherailwaystation Takesomeexerciseifyouwanttobethinner loseweight Testyourself
